title: X-ray density changes in the heart recorded by the electrokymograph.
authors.forename: G C
authors.initials: GC
authors.lastname: RING
authors.forename: C R
authors.initials: CR
authors.lastname: MICHIE
authors.forename: M J
authors.initials: MJ
authors.lastname: OPPENHEIMER
mesh_terms: D004571:Electrokymography; D006321:Heart; D006801:Humans; D007734:Kymography; D019616:Thoracic Surgical Procedures; D014965:X-Rays